Earlier quoted context omitted.
I don't think that's the case. If you browse HN somewhat regularly, you'll see that a lot of times when a post makes it to the top (Or close enough) it's very likely that a related post will make the rounds pretty soon. I think it's more related to people trying to ride the karma wave than "A coordinated takedown of ad tech companies". And it is effective, because it happens way too often.
Yes, this was just a standard follow-up [1] and we did the standard counter-follow-up, which is to merge the threads. [1] https://hn.algolia.com/?query=follow-up%20by%3Adang&dateRang...
Examples would be:
1. follow-up submissions
2. an initial wave of critical comments followed by a wave of apologist comments
3. first page of comments occupied by a single top level comment with lots of descendants (you often post to draw attention to other pages of comments in these cases)